Lighting Control Circuit for Solid-State Lamps
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lamps using solid-state light-emitting elements connected to electronic ballasts for fluorescent lamps experience unstable lighting and power inefficiency due to the protection operation of the ballast being compromised when the output voltage is adjusted to match the fluorescent lamp's voltage, leading to either unstable lighting or reduced power savings.
Innovation Solution
A lighting control circuit with a rectifier, series solid-state light-emitting elements, a smoothing capacitor, and a switching control circuit that generates an output voltage equal to the ballast's startup voltage initially and then lowers it after a predetermined time, allowing stable lighting and power savings by switching the series light emitter to a parallel configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the output voltage of the electric ballast is set to be close to the output voltage while a fluorescent lamp is connected, then the lighting stability of the lamp is improved, but the power saving effect deteriorates
Solution Approach 1:
The patent applies dynamics by making the connection configuration of solid-state light-emitting elements changeable over time. During startup, elements are connected in series to generate high voltage for stable lighting initiation. After startup, the connection switches to parallel configuration to reduce power consumption while maintaining stable operation. This temporal dynamic adjustment resolves the contradiction between lighting stability and power saving.
Solution Approach 2:
The patent changes the electrical connection parameter (series vs. parallel) of the solid-state light-emitting elements at different operational stages. By switching from series connection (high voltage, stable startup) to parallel connection (low voltage, power saving), the system achieves both lighting stability during startup and energy efficiency during normal operation.
2Loss of energy
If the output voltage of the electric ballast is set to be lower than the output voltage while a fluorescent lamp is connected, then the power saving is improved, but the lighting stability of the lamp deteriorates
Solution Approach 1:
The system dynamically adjusts the connection configuration based on operational phase. During startup when stability is critical, elements are connected in series. After successful startup, the system transitions to parallel connection for power saving, demonstrating dynamic adaptation to different operational requirements.
Solution Approach 2:
The patent applies preliminary action by establishing series connection before startup to ensure stable voltage generation for reliable lighting initiation. Once startup is complete, the system switches to parallel connection for power saving, ensuring that stability requirements are met before transitioning to energy-efficient mode.
3Adaptability or versatility
If a lamp having a rectifier circuit, smoothing circuit, and solid-state light-emitting element is attached to an electronic ballast of a fluorescent lamp, then the adaptability is improved, but the protection operation of the electronic ballast deteriorates
Solution Approach 1:
The patent changes the electrical connection configuration of solid-state light-emitting elements from series to parallel after startup. This parameter change modifies the electrical characteristics presented to the ballast, allowing the lamp to adapt to the ballast's protection mechanisms while maintaining operational compatibility.
Solution Approach 2:
By dynamically switching the connection configuration, the lamp presents different electrical characteristics at different times. During startup, series connection provides high voltage compatibility. After startup, parallel connection reduces power consumption and allows the protection operation to function properly, thus resolving the adaptability-protection contradiction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables stable lighting of solid-state light-emitting element lamps while reducing power consumption by maintaining the output voltage close to the fluorescent lamp's voltage during startup and lowering it post-stabilization, achieving both stability and energy efficiency.
Implementation Method 1
a rectifier connected to an electric ballast to which a commercial AC power is supplied, and configured to convert an AC to a DC
Implementation Method 2
a smoothing capacitor provided in parallel with the series light emitter in a current supply line between the rectifier and the series light emitter, and configured to eliminate an AC component included in the DC from an output side of the rectifier
Implementation Method 3
a series light emitter a plurality of solid-state light-emitting elements is connected in series
Data Source
AI summary
A lighting control circuit includes a rectifier connected to an electric ballast to which a commercial AC power is supplied, and configured to convert an AC to a DC, a series light emitter a plurality of solid-state light-emitting elements is connected in series, a smoothing capacitor provided in parallel with the series light emitter in a current supply line between the rectifier and the series light emitter, and configured to eliminate an AC component included in the DC from an output side of the rectifier, and a switching control circuit configured to generate an output voltage equal to an output voltage from the electric ballast when a fluorescent lamp starts up upon the connection of the fluorescent lamp to the electric ballast as a startup voltage in the startup of the series light emitter.